Diffusion Lab

Today in science class I learned new words such as diffusion and osmosis.  I also learned that if you put a bag of starch mixed with water into a beaker filled with water and iodine the bag of starch and water turns purple after 15 minutes.  In the beginning when we put the baggie into the water/idoine the water was orange but grudually changed color.  From this lab i learned an intresting fact, that molecules don't like to be crammed togather they want to move around freely.  An example Mrs. Rousseau gave was that if she put all of Omega and Chi in the science room everyone will be crammed together.  When she opens the room people will start to drift out, this is the same with molecules.  I also learned that the plastic bag was permeable to iodine since that was what the lab thought us.